FindWindowEx:
Parameters
hwndParent
Handle to the parent window whose child windows are to be searched.
If hwndParent is NULL, the function uses the desktop window as the parent window. The function searches among windows that are child windows of the desktop.
Windows NT 5.0 and later: If hwndParent is HWND_MESSAGE, the function searches all message-only windows.
hwndChildAfter
Handle to a child window. The search begins with the next child window in the Z order. The child window must be a direct child window of hwndParent, not just a descendant window.
If hwndChildAfter is NULL, the search begins with the first child window of hwndParent.
Note that if both hwndParent and hwndChildAfter are NULL, the function searches all top-level and message-only windows.
lpszClass
Pointer to a null-terminated string that specifies the class name or is an atom that identifies the class-name string. If this parameter is an atom, it must be a global atom created by a previous call to theGlobalAddAtom function. The atom, a 16-bit value, must be placed in the low-order word of lpszClass; the high-order word must be zero.
lpszWindow
Pointer to a null-terminated string that specifies the window name (the window's title). If this parameter is NULL, all window names match.